package v2ch11.print;

import javax.swing.*;
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.print.*;

/**
 * This component generates a 2D graphics image for screen display and printing.
 */
public class PrintComponent extends JComponent implements Printable {
	private static final Dimension PREFERRED_SIZE = new Dimension(300, 300);
	
	public void paintComponent(Graphics g) {
		Graphics2D g2 = (Graphics2D) g;
		drawPage(g2);
	}
	
	public int print(Graphics g, PageFormat pf, int page) throws PrinterException {
		if (page >= 1) return Printable.NO_SUCH_PAGE;
		Graphics2D g2 = (Graphics2D) g;
		g2.translate(pf.getImageableX(), pf.getImageableY());
		g2.draw(new Rectangle2D.Double(0, 0, pf.getImageableWidth(), pf.getImageableHeight()));
		
		drawPage(g2);
		return Printable.PAGE_EXISTS;
	}
	
	/**
	 * This method draws the page both on the screen and the printer graphics context.
	 *
	 * @param g2 the graphics context
	 */
	public void drawPage(Graphics2D g2) {
		FontRenderContext context = g2.getFontRenderContext();
		Font f = new Font("Serif", Font.PLAIN, 72);
		GeneralPath clipShape = new GeneralPath();
		
		TextLayout layout = new TextLayout("Hello", f, context);
		AffineTransform transform = AffineTransform.getTranslateInstance(0, 72);
		Shape outline = layout.getOutline(transform);
		clipShape.append(outline, false);
		
		layout = new TextLayout("World", f, context);
		transform = AffineTransform.getTranslateInstance(0, 144);
		outline = layout.getOutline(transform);
		clipShape.append(outline, false);
		
		g2.draw(clipShape);
		g2.clip(clipShape);
		
		final int NLINES = 50;
		Point2D p = new Point2D.Double(0, 0);
		for (int i = 0; i < NLINES; i++) {
			double x = (2 * getWidth() * i) / NLINES;
			double y = (2 * getHeight() * (NLINES - 1 - i)) / NLINES;
			Point2D q = new Point2D.Double(x, y);
			g2.draw(new Line2D.Double(p, q));
		}
	}
	
	public Dimension getPreferredSize() {
		return PREFERRED_SIZE;
	}
}
